[Sipping] Technical reports on Skype protocol analysis and SIP in peer-to-peer mode

The IETF Sipping mailing list posting [Sipping] Technical reports on Skype protocol analysis and SIP in peer-to-peer mode producing two very interesting studies on SIP and especially this publication which decomposes as much of the Skype protocol that can be inferred from the unencrypted bits of the messages. Amazing what Ethereal will allow glimpses of!